A misplaced foal is changed beyond recognition at an early age and is sent to the most unlikely of caretakers. And after years of living among those that live and thrive in the seas, she is forcibly 'returned' home.

When she returns, will she bring about the ruin of Equestria...

Or will she bring Equestria to glory beyond what it is now?

A different crossover between My Little Pony and Aoki Hagane no Arpeggio.
I do not own either as Hasbro and Ark Performance/Sanzigen.